US20100282335A1 - Fuel vapor vent valve with dynamic pressure relief - Google Patents
Fuel vapor vent valve with dynamic pressure relief Download PDFInfo
- Publication number
- US20100282335A1 US20100282335A1 US12/767,856 US76785610A US2010282335A1 US 20100282335 A1 US20100282335 A1 US 20100282335A1 US 76785610 A US76785610 A US 76785610A US 2010282335 A1 US2010282335 A1 US 2010282335A1
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- United States
- Prior art keywords
- vapor
- vapor passage
- fuel
- passage
- fluid communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K24/00—Devices, e.g. valves, for venting or aerating enclosures
- F16K24/04—Devices, e.g. valves, for venting or aerating enclosures for venting only
- F16K24/042—Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float
- F16K24/044—Devices, e.g. valves, for venting or aerating enclosures for venting only actuated by a float the float being rigidly connected to the valve element, the assembly of float and valve element following a substantially translational movement when actuated, e.g. also for actuating a pilot valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
- F16K17/19—Equalising valves predominantly for tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0753—Control by change of position or inertia of system
- Y10T137/0874—Vent opening or closing on tipping container
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2931—Diverse fluid containing pressure systems
- Y10T137/3003—Fluid separating traps or vents
- Y10T137/3084—Discriminating outlet for gas
- Y10T137/309—Fluid sensing valve
- Y10T137/3099—Float responsive
Definitions
- the invention generally relates to a fuel vapor vent valve assembly, and more specifically to an anti-trickle valve for the fuel vapor vent valve assembly.
- Fuel storage systems for vehicles include a fuel tank.
- the fuel tank includes an inlet, to which a filler pipe is attached, through which fuel is dispensed into the tank.
- the fuel tank further includes an outlet, through which fuel is directed to an engine.
- the fuel tank may further include a fuel vapor vent valve assembly, disposed on a top wall of the fuel tank. The fuel vapor vent valve assembly provides an outlet to vent fuel vapors from within an interior of the fuel tank.
- the fuel vapor vent valve assembly vents the fuel vapor from within the fuel tank to maintain a vapor head within a predetermined range when the vapor pressure rises above the predetermined range.
- the fuel vapor vent valve assembly may further include a liquid/vapor discriminator, commonly referred to as a roll-over valve.
- the liquid/vapor discriminator is configured to allow the fuel vapors to pass through the fuel vapor vent valve assembly during normal operating conditions, but is configured to block fluid communication between the fuel tank and the fuel vapor vent valve assembly when the fuel tank is oriented at an extreme angle or upside down, such as in the event of a vehicular roll-over.
- the fuel tank may further include a vacuum relief valve, which is configured to relieve a vacuum pressure from within the fuel tank.
- a fuel vapor vent valve assembly for a fuel tank of a vehicle is provided.
- the vent valve assembly includes a housing having an outlet, and defining an interior opening. The interior opening is in fluid communication with the outlet.
- the fuel vapor vent valve assembly further includes a liquid/vapor discriminator coupled to the housing.
- the liquid/vapor discriminator is movable between an open position and a closed position. When in the open position, the liquid/vapor discriminator allows fluid communication between an interior of the fuel tank and the interior opening of the housing. When in the closed position, the liquid/vapor discriminator prevents fluid communication between the interior of the fuel tank and the interior opening of the housing.
- the fuel vapor vent valve assembly further includes an anti-trickle valve disposed within the interior opening of the housing.
- the anti-trickle valve opens and closes fluid communication between the interior opening of the housing and the liquid/vapor discriminator to selectively allow fluid communication between the interior opening of the housing and the interior of the fuel tank when the liquid/vapor discriminator is in the open position.
- the anti-trickle valve includes a dynamic pressure relief mechanism, which includes a movable element. The movable element opens fluid communication between the interior opening of the housing and the liquid/vapor discriminator in response to a change in motion, to vent vapor pressure from the interior of the fuel tank.
- the anti-trickle valve for a fuel vapor vent assembly of a fuel tank of a vehicle is also provided.
- the anti-trickle valve includes a casing including an upper portion and a lower portion.
- the upper portion defines an upper dynamic vapor passage and an upper vacuum relief vapor passage.
- the lower portion defines a lower dynamic vapor passage and a lower vacuum relief vapor passage.
- the upper portion and the lower portion of the casing cooperate to define a first cavity in fluid communication with the upper dynamic vapor passage and the lower dynamic vapor passage, and a second cavity in fluid communication with the upper vacuum relief vapor passage and the lower vacuum relief vapor passage.
- the anti-trickle valve further includes a float disposed within the second cavity.
- the float seals against the upper vacuum relief vapor passage when a vapor pressure in the fuel tank exceeds a predetermined value.
- the float also withdraws from sealing engagement with the upper vacuum relief vapor passage when a vacuum pressure from within the fuel tank falls below the predetermined value to open fluid communication between the upper vacuum relief vapor passage and the lower vacuum relief vapor passage.
- the anti-trickle valve further includes a movable element disposed within the first cavity. The movable element opens fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage in response to a change in motion, to vent vapor pressure from within the fuel tank during movement of the vehicle.
- the movable element allows the anti-trickle valve to vent fuel vapors from within the fuel tank in response to movement of the vehicle.
- the movable element moves within the first cavity to open fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage.
- the movable element moves back into sealing engagement with the lower dynamic vapor passage to close fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage.
- FIG. 1 is a schematic cross sectional view of a fuel vapor vent valve assembly.
- FIG. 2 is an enlarged partial schematic cross sectional view of the fuel vapor vent valve assembly, showing an anti-trickle valve in a first position.
- FIG. 3 is an enlarged partial schematic cross sectional view of the fuel vapor vent valve assembly, showing the anti-trickle valve in a second position.
- FIG. 4 is a schematic perspective cross sectional view of the anti-trickle valve when at rest and subjected to a vacuum pressure.
- FIG. 5 is a schematic perspective cross sectional view of the anti-trickle valve during a change in motion and subjected to a positive vapor pressure.
- a fuel vapor vent valve assembly is shown generally at 20 .
- the fuel vapor vent valve assembly 20 is for a fuel tank 22 of a vehicle (not shown).
- the fuel vapor vent valve assembly 20 controls the flow of vapors out of and into the fuel tank 22 to regulate a vapor pressure head within an interior 21 of the fuel tank 22 . Accordingly, the fuel vapor vent valve assembly 20 releases fuel vapors and/or air from within the fuel tank 22 to vent the fuel tank 22 and permits air flow into the fuel tank 22 in response to a vacuum pressure within the fuel tank 22 .
- the fuel vapor vent valve assembly 20 includes a housing 24 .
- the housing 24 defines an outlet 26 , a vapor port 28 , and an interior opening 30 in fluid communication with the outlet 26 and the vapor port 28 .
- the outlet 26 may be, but is not required to be, connected to some other component, such as a vapor canister (not shown). However, the outlet 26 is maintained at atmospheric pressure. Any vapors vented from the fuel tank 22 are exhausted through the outlet 26 .
- the vapor port 28 is in fluid communication with fuel tank 22 .
- the interior opening 30 of the housing 24 is disposed between the outlet 26 and the vapor port 28 .
- the fuel vapor vent valve assembly 20 includes a liquid/vapor discriminator 32 a , 32 b , commonly referred to as a roll-over valve.
- the liquid/vapor discriminator 32 a , 32 b is coupled to the housing 24 , adjacent to and in fluid communication with the vapor port 28 . Accordingly, the vapor port 28 connects the interior opening 30 of the housing 24 and the liquid/vapor discriminator 32 a , 32 b .
- the liquid/vapor discriminator 32 a , 32 b is movable between an open position and a closed position. When in the open position, the liquid/vapor discriminator 32 a , 32 b allows fluid communication, particularly vapor communication, between an interior of the fuel tank 22 and the interior opening 30 of the housing 24 .
- the liquid/vapor discriminator 32 a , 32 b When in the closed position, the liquid/vapor discriminator 32 a , 32 b is configured to prevent fluid communication, including vapor communication, between the interior of the fuel tank 22 and the interior opening 30 of the housing 24 .
- the liquid/vapor discriminator 32 a , 32 b operates to prevent liquid fuel spillage from the fuel tank 22 when the fuel tank 22 is disposed at extreme angles or upside-down, such as during a roll-over event.
- the liquid/vapor discriminator 32 a , 32 b may be designed and/or configured in any suitable manner tht restricts liquid fuel from spilling from the fuel tank 22 when the fuel tank is disposed at an extreme angle or upside down.
- the fuel vapor vent valve assembly 20 includes a first liquid/vapor discriminator 32 a and a second liquid/vapor discriminator 32 b .
- the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b are vertically offset from each other to open and/or close fluid communication between the fuel tank 22 and the interior opening 30 of the housing 24 at different fuel levels within the fuel tank 22 .
- the fuel vapor vent assembly need not include both the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b .
- first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b need not both be disposed in the housing 24 , i.e, the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b may be separate and independent units.
- the fuel vapor vent valve assembly 20 further includes an anti-trickle valve 34 .
- the anti-trickle valve 34 is disposed within the interior opening 30 of the housing 24 .
- the anti-trickle valve 34 opens and closes fluid communication between the interior opening 30 of the housing 24 and the first liquid/vapor discriminator 32 a when the first liquid/vapor discriminator 32 a is in the open position.
- the anti-trickle valve 34 opens and closes fluid communication, particularly vapor communication, to selectively allow fluid communication, i.e., vapor communication, between the interior opening 30 of the housing 24 and the interior of the fuel tank 22 .
- the anti-trickle valve 34 operates to prevent overfilling of the fuel tank 22 , particularly when a low vapor pressure exists within the fuel tank 22 .
- the anti-trickle valve 34 blocks the vapor port 28 to the first liquid/vapor discriminator 32 a to prevent “trickle fill” of fuel into the fuel tank 22 , and thereby prevent overfilling of the fuel tank 22 .
- the anti-trickle valve 34 includes a casing 36 defining a first cavity 38 and a second cavity 40 that is separate from the first cavity 38 .
- the casing 36 may include a bottom portion 42 and an upper portion 44 , with the upper portion 44 securely affixed to the bottom portion 42 .
- the upper portion 44 and the bottom portion 42 cooperate to define the first cavity 38 and the second cavity 40 .
- the casing 36 defines an upper dynamic vapor passage 46 a , 46 b and a lower dynamic vapor passage 48 .
- the upper dynamic vapor passage 46 a , 46 b is configured for communicating vapor between the interior opening 30 of the housing 24 and the first cavity 38 .
- the lower dynamic vapor passage 48 is configured for communicating vapor between the first cavity 38 and the vapor port 28 , and thereby to the liquid/vapor discriminator 32 a .
- the upper dynamic vapor passage 46 a , 46 b may include, but is not limited to, a first upper dynamic vapor passage 46 a and a second upper dynamic vapor passage 46 b .
- the second upper dynamic vapor passage 46 b is laterally offset and spaced from the first upper dynamic vapor passage 46 a.
- the casing 36 further defines an upper vacuum relief vapor passage 50 and a lower vacuum relief vapor passage 52 a , 52 b .
- the upper vacuum relief vapor passage 50 is configured for communicating vapor between the interior opening 30 of the housing 24 and the second cavity 40 .
- the lower vacuum relief vapor passage 52 a , 52 b communicates vapor between the second cavity 40 and the vapor port 28 , and thereby to the liquid/vapor discriminator 32 .
- the lower vacuum relief vapor passage 52 a , 52 b may include, but is not limited to, a first lower vacuum relief vapor passage 52 a and a second lower vacuum relief vapor passage 52 b .
- the second lower vacuum relief vapor passage 52 b is laterally offset and spaced from the first lower vacuum relief vapor passage 52 a.
- the bottom portion 42 of the casing 36 defines the lower dynamic vapor passage 48 and the lower vacuum relief vapor passage 52 a , 52 b
- the upper portion 44 defines the upper dynamic vapor passage 46 a , 46 b and the upper vacuum relief vapor passage 50 .
- the casing 36 may be configured differently than as shown and described herein.
- the anti-trickle valve 34 includes a dynamic pressure relief mechanism 54 .
- the dynamic pressure relief mechanism 54 includes a movable element 56 .
- the movable element 56 is configured for opening fluid communication, particularly vapor communication, between the interior opening 30 of the housing 24 and the vapor port 28 , and more specifically with the liquid/vapor discriminator 32 , in response to a change in motion.
- the movable element 56 opens fluid communication in response to movement of the vehicle to vent vapor pressure from the interior of the fuel tank 22 during movement of the vehicle.
- the movable element 56 moves to open vapor communication between interior opening 30 of the housing 24 and the fuel tank 22 to vent the increased vapor pressure.
- the movable element 56 is disposed within the first cavity 38 .
- the movable element 56 may include, but is not limited to, a spherical element.
- movable element 56 may include a stainless steel ball.
- the movable element 56 may be configured other than shown and described herein.
- the casing 36 of the anti-trickle valve 34 includes a concave ramp 58 . More specifically, an upper surface 60 of the lower portion of the casing 36 defines the concave ramp 58 .
- the concave ramp 58 is concentric with the lower dynamic vapor passage 48 . As shown in FIG. 4 , the concave ramp 58 centers the movable element 56 over the dynamic vapor passage when the vehicle is at rest. As such, when there is no change in valve motion, the movable element 56 moves down the concave ramp 58 into sealing engagement with the lower dynamic vapor passage 48 to prevent fluid communication, i.e., vapor communication between the fuel tank 22 and the outlet 26 . As shown in FIG.
- the movable element 56 is movable upward along the concave ramp 58 in response to a change in motion of the vehicle, i.e., acceleration of the vehicle, to open fluid communication between the upper dynamic vapor passage 46 a , 46 b and the lower dynamic vapor passage 48 .
- Acceleration of the vehicle i.e., a change in motion of the vehicle, may include, but is not limited to horizontal acceleration, vertical acceleration and/or radial acceleration.
- the movable element 56 moves up the concave ramp 58 out of sealing engagement with the lower dynamic vapor passage 48 , to permit fluid communication, i.e., vapor communication, between the fuel tank 22 and the outlet 26 .
- the movable element 56 includes a mass sufficient for the movable element 56 to resist movement up the concave ramp 58 by vapor pressure having a value above a predetermined level.
- the moveable element 56 may include a mass sufficient to resist movement up the concave ramp 58 by vapor pressure having a value of at least 3 kPa.
- the predetermined level may include a vapor pressure other than the 3 kPa described above, and may be set based upon any specific design considerations.
- a vapor pressure within the fuel tank 22 and more specifically at the vapor port 28 , of below the predetermined level, e.g., below 3 kPa, will not move the movable element 56 up the concave ramp 58 , while a vapor pressure greater than the predetermined level, e.g., greater than 3 kPa, may move the movable element 56 up the concave ramp 58 , thereby opening fluid communication between the fuel tank 22 and the outlet 26 .
- the anti-trickle valve 34 includes a vacuum relief mechanism 62 .
- the vacuum relief mechanism 62 opens fluid communication between the interior opening 30 of the housing 24 and the vapor port 28 , and more specifically the liquid/vapor discriminator 32 a , to relieve vacuum pressure within the fuel tank 22 .
- the vacuum relief mechanism 62 includes a float 64 disposed within the second cavity 40 .
- the float 64 may include, but is not limited to, a plastic spherical ball or the like.
- the upper vacuum relief vapor passage 50 includes a circular port.
- the float 64 is configured to seal against the circular port of the upper vacuum relief vapor passage 50 in response to the vapor pressure from within the fuel tank 22 having a value greater than a selected vacuum level, such as 0 kPa, to bias the float 64 upwards.
- the vapor pressure at the vapor port 28 when the vapor pressure at the vapor port 28 , and more specifically when the vapor pressure at the fuel tank 22 , is greater than 0 kPa in this example, the vapor pressure moves the float 64 into sealing engagement with the upper vacuum relief vapor passage 50 to block fluid communication, particularly vapor communication, between the interior opening 30 of the housing 24 and the fuel tank 22 .
- the float 64 is configured to withdraw from sealing engagement with the circular port of the upper vacuum relief vapor passage 50 in response to a vacuum pressure from within the fuel tank 22 , which draws the float 64 downwards to open fluid communication between the upper vacuum relief vapor passage 50 and the lower vacuum relief vapor passage 52 a , 52 b .
- a selected vacuum pressure level i.e., a pressure less than 0 kPa
- the vacuum pressure draws the float 64 vertically downward away from and out of sealing engagement with the upper vacuum relief vapor passage 50 , thereby opening fluid communication, and particularly vapor communication, between the interior opening 30 of the housing 24 and the fuel tank 22 to permit air to enter the fuel tank 22 and fill the vacuum.
- the casing 36 may include a plurality of ribs 66 radially spaced about and adjacent the lower vacuum relief vapor passage 52 a , 52 b . More specifically, the upper surface 60 of the lower portion of the casing 36 defines the ribs 66 .
- the ribs 66 vertically space the float 64 from the lower vacuum relief vapor passage 52 a , 52 b when the float 64 is drawn vertically downward by a vacuum pressure. As such, the ribs 66 prevent the vacuum pressure from drawing the float 64 downward into sealing engagement with the lower vacuum relief vapor passage 52 .
- the housing 24 includes a ridge 68 disposed circumferentially about the vapor port 28 , the lower dynamic vapor passage 48 and the lower vacuum relief vapor passage 52 a , 52 b .
- the ridge 68 may include any suitable shape, including but not limited to, a circular shape or a rectangular shape.
- the anti-trickle valve 34 is movable between a first position, shown in FIG. 2 , and a second position, shown in FIG. 3 .
- the anti-trickle valve 34 When in the first position, the anti-trickle valve 34 is disposed in sealing engagement with the ridge 68 to seal the vapor port 28 , the lower dynamic vapor passage 48 and the lower vacuum relief vapor passage 52 a , 52 b from the interior opening 30 of the housing 24 .
- the anti-trickle valve 34 is vertically spaced from the ridge 68 to permit fluid communication, and particularly vapor communication, around a periphery of the anti-trickle valve 34 between the vapor port 28 and the outlet 26 .
- the housing 24 may define a plurality of flow channels (not shown) disposed about the periphery of the casing 36 to facilitate fluid communication around the periphery of the anti-trickle valve 34 .
- the fuel vapor vent valve assembly 20 further includes a biasing device 70 .
- the biasing device 70 is configured for biasing the anti-trickle valve 34 into the first position.
- the biasing device 70 may include, but is not limited to, a coil spring or the like.
- the biasing device 70 has a stiffness sufficient to resist movement of the anti-trickle valve 34 when it responds to a vapor pressure from within the fuel tank 22 having a value less than a first predetermined value (e.g., less than 3 kPa). Accordingly, if the vapor pressure within the fuel tank 22 and at the vapor port 28 is less than 3 kPa, then the biasing device 70 maintains the anti-trickle valve 34 in the first position.
- the pressure exerted on the anti-trickle valve 34 from the vapor pressure is sufficient to move the biasing device 70 , e.g., compress the coil spring, and move the anti-trickle valve 34 into the second position.
- the biasing device 70 e.g., compress the coil spring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
Abstract
Description
- This application claims the benefit if U.S. Provisional Patent Application Ser. No. 61/176,998, filed on May 11, 2009, the disclosure of which is hereby incorporated by reference.
- The invention generally relates to a fuel vapor vent valve assembly, and more specifically to an anti-trickle valve for the fuel vapor vent valve assembly.
- Fuel storage systems for vehicles include a fuel tank. The fuel tank includes an inlet, to which a filler pipe is attached, through which fuel is dispensed into the tank. The fuel tank further includes an outlet, through which fuel is directed to an engine. The fuel tank may further include a fuel vapor vent valve assembly, disposed on a top wall of the fuel tank. The fuel vapor vent valve assembly provides an outlet to vent fuel vapors from within an interior of the fuel tank.
- During refueling of the fuel tank, operation of the vehicle, or as a result of temperature change of the fuel, the vapor pressure within the tank may change, i.e., increase or decrease. The fuel vapor vent valve assembly vents the fuel vapor from within the fuel tank to maintain a vapor head within a predetermined range when the vapor pressure rises above the predetermined range. The fuel vapor vent valve assembly may further include a liquid/vapor discriminator, commonly referred to as a roll-over valve. The liquid/vapor discriminator is configured to allow the fuel vapors to pass through the fuel vapor vent valve assembly during normal operating conditions, but is configured to block fluid communication between the fuel tank and the fuel vapor vent valve assembly when the fuel tank is oriented at an extreme angle or upside down, such as in the event of a vehicular roll-over. The fuel tank may further include a vacuum relief valve, which is configured to relieve a vacuum pressure from within the fuel tank.
- A fuel vapor vent valve assembly for a fuel tank of a vehicle is provided. The vent valve assembly includes a housing having an outlet, and defining an interior opening. The interior opening is in fluid communication with the outlet. The fuel vapor vent valve assembly further includes a liquid/vapor discriminator coupled to the housing. The liquid/vapor discriminator is movable between an open position and a closed position. When in the open position, the liquid/vapor discriminator allows fluid communication between an interior of the fuel tank and the interior opening of the housing. When in the closed position, the liquid/vapor discriminator prevents fluid communication between the interior of the fuel tank and the interior opening of the housing. The fuel vapor vent valve assembly further includes an anti-trickle valve disposed within the interior opening of the housing. The anti-trickle valve opens and closes fluid communication between the interior opening of the housing and the liquid/vapor discriminator to selectively allow fluid communication between the interior opening of the housing and the interior of the fuel tank when the liquid/vapor discriminator is in the open position. The anti-trickle valve includes a dynamic pressure relief mechanism, which includes a movable element. The movable element opens fluid communication between the interior opening of the housing and the liquid/vapor discriminator in response to a change in motion, to vent vapor pressure from the interior of the fuel tank.
- An anti-trickle valve for a fuel vapor vent assembly of a fuel tank of a vehicle is also provided. The anti-trickle valve includes a casing including an upper portion and a lower portion. The upper portion defines an upper dynamic vapor passage and an upper vacuum relief vapor passage. The lower portion defines a lower dynamic vapor passage and a lower vacuum relief vapor passage. The upper portion and the lower portion of the casing cooperate to define a first cavity in fluid communication with the upper dynamic vapor passage and the lower dynamic vapor passage, and a second cavity in fluid communication with the upper vacuum relief vapor passage and the lower vacuum relief vapor passage. The anti-trickle valve further includes a float disposed within the second cavity. The float seals against the upper vacuum relief vapor passage when a vapor pressure in the fuel tank exceeds a predetermined value. The float also withdraws from sealing engagement with the upper vacuum relief vapor passage when a vacuum pressure from within the fuel tank falls below the predetermined value to open fluid communication between the upper vacuum relief vapor passage and the lower vacuum relief vapor passage. The anti-trickle valve further includes a movable element disposed within the first cavity. The movable element opens fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage in response to a change in motion, to vent vapor pressure from within the fuel tank during movement of the vehicle.
- Accordingly, the movable element allows the anti-trickle valve to vent fuel vapors from within the fuel tank in response to movement of the vehicle. As the vapor pressure within the tank rises during operation of the vehicle, for example, by the fuel sloshing and/or an increase in temperature of the fuel, the movable element moves within the first cavity to open fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage. Once the vehicle comes to rest, the movable element moves back into sealing engagement with the lower dynamic vapor passage to close fluid communication between the upper dynamic vapor passage and the lower dynamic vapor passage.
- The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
-
FIG. 1 is a schematic cross sectional view of a fuel vapor vent valve assembly. -
FIG. 2 is an enlarged partial schematic cross sectional view of the fuel vapor vent valve assembly, showing an anti-trickle valve in a first position. -
FIG. 3 is an enlarged partial schematic cross sectional view of the fuel vapor vent valve assembly, showing the anti-trickle valve in a second position. -
FIG. 4 is a schematic perspective cross sectional view of the anti-trickle valve when at rest and subjected to a vacuum pressure. -
FIG. 5 is a schematic perspective cross sectional view of the anti-trickle valve during a change in motion and subjected to a positive vapor pressure. - Referring to the Figures, wherein like numerals indicate like parts throughout the different views, a fuel vapor vent valve assembly is shown generally at 20. The fuel vapor
vent valve assembly 20 is for afuel tank 22 of a vehicle (not shown). The fuel vaporvent valve assembly 20 controls the flow of vapors out of and into thefuel tank 22 to regulate a vapor pressure head within aninterior 21 of thefuel tank 22. Accordingly, the fuel vaporvent valve assembly 20 releases fuel vapors and/or air from within thefuel tank 22 to vent thefuel tank 22 and permits air flow into thefuel tank 22 in response to a vacuum pressure within thefuel tank 22. - Referring to
FIG. 1 , the fuel vaporvent valve assembly 20 includes ahousing 24. Thehousing 24 defines anoutlet 26, avapor port 28, and an interior opening 30 in fluid communication with theoutlet 26 and thevapor port 28. Theoutlet 26 may be, but is not required to be, connected to some other component, such as a vapor canister (not shown). However, theoutlet 26 is maintained at atmospheric pressure. Any vapors vented from thefuel tank 22 are exhausted through theoutlet 26. Thevapor port 28 is in fluid communication withfuel tank 22. The interior opening 30 of thehousing 24 is disposed between theoutlet 26 and thevapor port 28. - The fuel vapor
vent valve assembly 20 includes a liquid/vapor discriminator 32 a, 32 b, commonly referred to as a roll-over valve. The liquid/vapor discriminator 32 a, 32 b is coupled to thehousing 24, adjacent to and in fluid communication with thevapor port 28. Accordingly, thevapor port 28 connects the interior opening 30 of thehousing 24 and the liquid/vapor discriminator 32 a, 32 b. The liquid/vapor discriminator 32 a, 32 b is movable between an open position and a closed position. When in the open position, the liquid/vapor discriminator 32 a, 32 b allows fluid communication, particularly vapor communication, between an interior of thefuel tank 22 and the interior opening 30 of thehousing 24. When in the closed position, the liquid/vapor discriminator 32 a, 32 b is configured to prevent fluid communication, including vapor communication, between the interior of thefuel tank 22 and theinterior opening 30 of thehousing 24. The liquid/vapor discriminator 32 a, 32 b operates to prevent liquid fuel spillage from thefuel tank 22 when thefuel tank 22 is disposed at extreme angles or upside-down, such as during a roll-over event. The liquid/vapor discriminator 32 a, 32 b may be designed and/or configured in any suitable manner tht restricts liquid fuel from spilling from thefuel tank 22 when the fuel tank is disposed at an extreme angle or upside down. - As shown, the fuel vapor
vent valve assembly 20 includes a first liquid/vapor discriminator 32 a and a second liquid/vapor discriminator 32 b. The first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b are vertically offset from each other to open and/or close fluid communication between thefuel tank 22 and theinterior opening 30 of thehousing 24 at different fuel levels within thefuel tank 22. However, it should be appreciated that the fuel vapor vent assembly need not include both the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b. Furthermore, it should be appreciated that the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b, need not both be disposed in thehousing 24, i.e, the first liquid/vapor discriminator 32 a and the second liquid/vapor discriminator 32 b may be separate and independent units. - Referring also to
FIGS. 2 through 4 , the fuel vaporvent valve assembly 20 further includes ananti-trickle valve 34. Theanti-trickle valve 34 is disposed within theinterior opening 30 of thehousing 24. Theanti-trickle valve 34 opens and closes fluid communication between theinterior opening 30 of thehousing 24 and the first liquid/vapor discriminator 32 a when the first liquid/vapor discriminator 32 a is in the open position. Theanti-trickle valve 34 opens and closes fluid communication, particularly vapor communication, to selectively allow fluid communication, i.e., vapor communication, between theinterior opening 30 of thehousing 24 and the interior of thefuel tank 22. - The
anti-trickle valve 34 operates to prevent overfilling of thefuel tank 22, particularly when a low vapor pressure exists within thefuel tank 22. For example, during refueling of thefuel tank 22, when the second liquid/vapor discriminator 32 b is completely closed due to a rise in the incoming fuel level, theanti-trickle valve 34 blocks thevapor port 28 to the first liquid/vapor discriminator 32 a to prevent “trickle fill” of fuel into thefuel tank 22, and thereby prevent overfilling of thefuel tank 22. - The
anti-trickle valve 34 includes acasing 36 defining afirst cavity 38 and asecond cavity 40 that is separate from thefirst cavity 38. Thecasing 36 may include abottom portion 42 and anupper portion 44, with theupper portion 44 securely affixed to thebottom portion 42. Theupper portion 44 and thebottom portion 42 cooperate to define thefirst cavity 38 and thesecond cavity 40. - The
casing 36 defines an upperdynamic vapor passage 46 a, 46 b and a lowerdynamic vapor passage 48. The upperdynamic vapor passage 46 a, 46 b is configured for communicating vapor between theinterior opening 30 of thehousing 24 and thefirst cavity 38. The lowerdynamic vapor passage 48 is configured for communicating vapor between thefirst cavity 38 and thevapor port 28, and thereby to the liquid/vapor discriminator 32 a. As shown, the upperdynamic vapor passage 46 a, 46 b may include, but is not limited to, a first upper dynamic vapor passage 46 a and a second upperdynamic vapor passage 46 b. The second upperdynamic vapor passage 46 b is laterally offset and spaced from the first upper dynamic vapor passage 46 a. - The
casing 36 further defines an upper vacuumrelief vapor passage 50 and a lower vacuumrelief vapor passage relief vapor passage 50 is configured for communicating vapor between theinterior opening 30 of thehousing 24 and thesecond cavity 40. The lower vacuumrelief vapor passage second cavity 40 and thevapor port 28, and thereby to the liquid/vapor discriminator 32. As shown, the lower vacuumrelief vapor passage relief vapor passage 52 a and a second lower vacuumrelief vapor passage 52 b. The second lower vacuumrelief vapor passage 52 b is laterally offset and spaced from the first lower vacuumrelief vapor passage 52 a. - As shown, the
bottom portion 42 of thecasing 36 defines the lowerdynamic vapor passage 48 and the lower vacuumrelief vapor passage upper portion 44 defines the upperdynamic vapor passage 46 a, 46 b and the upper vacuumrelief vapor passage 50. However, it should be appreciated that thecasing 36 may be configured differently than as shown and described herein. - The
anti-trickle valve 34 includes a dynamicpressure relief mechanism 54. The dynamicpressure relief mechanism 54 includes amovable element 56. Themovable element 56 is configured for opening fluid communication, particularly vapor communication, between theinterior opening 30 of thehousing 24 and thevapor port 28, and more specifically with the liquid/vapor discriminator 32, in response to a change in motion. Themovable element 56 opens fluid communication in response to movement of the vehicle to vent vapor pressure from the interior of thefuel tank 22 during movement of the vehicle. Accordingly, as vapor pressure builds during movement of the vehicle, for example, by the mixing of the fuel with the air in thefuel tank 22, or with an increased temperature of the fuel within thefuel tank 22, themovable element 56 moves to open vapor communication between interior opening 30 of thehousing 24 and thefuel tank 22 to vent the increased vapor pressure. - The
movable element 56 is disposed within thefirst cavity 38. As shown, themovable element 56 may include, but is not limited to, a spherical element. For example,movable element 56 may include a stainless steel ball. However, it should be appreciated that themovable element 56 may be configured other than shown and described herein. - The
casing 36 of theanti-trickle valve 34 includes aconcave ramp 58. More specifically, anupper surface 60 of the lower portion of thecasing 36 defines theconcave ramp 58. Theconcave ramp 58 is concentric with the lowerdynamic vapor passage 48. As shown inFIG. 4 , theconcave ramp 58 centers themovable element 56 over the dynamic vapor passage when the vehicle is at rest. As such, when there is no change in valve motion, themovable element 56 moves down theconcave ramp 58 into sealing engagement with the lowerdynamic vapor passage 48 to prevent fluid communication, i.e., vapor communication between thefuel tank 22 and theoutlet 26. As shown inFIG. 5 , themovable element 56 is movable upward along theconcave ramp 58 in response to a change in motion of the vehicle, i.e., acceleration of the vehicle, to open fluid communication between the upperdynamic vapor passage 46 a, 46 b and the lowerdynamic vapor passage 48. Acceleration of the vehicle, i.e., a change in motion of the vehicle, may include, but is not limited to horizontal acceleration, vertical acceleration and/or radial acceleration. As such, as the vehicle changes motion, themovable element 56 moves up theconcave ramp 58 out of sealing engagement with the lowerdynamic vapor passage 48, to permit fluid communication, i.e., vapor communication, between thefuel tank 22 and theoutlet 26. - The
movable element 56 includes a mass sufficient for themovable element 56 to resist movement up theconcave ramp 58 by vapor pressure having a value above a predetermined level. For example, themoveable element 56 may include a mass sufficient to resist movement up theconcave ramp 58 by vapor pressure having a value of at least 3 kPa. It should be appreciated that the predetermined level may include a vapor pressure other than the 3 kPa described above, and may be set based upon any specific design considerations. Accordingly, a vapor pressure within thefuel tank 22, and more specifically at thevapor port 28, of below the predetermined level, e.g., below 3 kPa, will not move themovable element 56 up theconcave ramp 58, while a vapor pressure greater than the predetermined level, e.g., greater than 3 kPa, may move themovable element 56 up theconcave ramp 58, thereby opening fluid communication between thefuel tank 22 and theoutlet 26. - The
anti-trickle valve 34 includes avacuum relief mechanism 62. Thevacuum relief mechanism 62 opens fluid communication between theinterior opening 30 of thehousing 24 and thevapor port 28, and more specifically the liquid/vapor discriminator 32 a, to relieve vacuum pressure within thefuel tank 22. - The
vacuum relief mechanism 62 includes afloat 64 disposed within thesecond cavity 40. Thefloat 64 may include, but is not limited to, a plastic spherical ball or the like. As shown, the upper vacuumrelief vapor passage 50 includes a circular port. As shown inFIG. 5 , thefloat 64 is configured to seal against the circular port of the upper vacuumrelief vapor passage 50 in response to the vapor pressure from within thefuel tank 22 having a value greater than a selected vacuum level, such as 0 kPa, to bias thefloat 64 upwards. Accordingly, when the vapor pressure at thevapor port 28, and more specifically when the vapor pressure at thefuel tank 22, is greater than 0 kPa in this example, the vapor pressure moves thefloat 64 into sealing engagement with the upper vacuumrelief vapor passage 50 to block fluid communication, particularly vapor communication, between theinterior opening 30 of thehousing 24 and thefuel tank 22. As shown inFIG. 4 , thefloat 64 is configured to withdraw from sealing engagement with the circular port of the upper vacuumrelief vapor passage 50 in response to a vacuum pressure from within thefuel tank 22, which draws thefloat 64 downwards to open fluid communication between the upper vacuumrelief vapor passage 50 and the lower vacuumrelief vapor passage vapor port 28, and more specifically within thefuel tank 22, then the vacuum pressure draws thefloat 64 vertically downward away from and out of sealing engagement with the upper vacuumrelief vapor passage 50, thereby opening fluid communication, and particularly vapor communication, between theinterior opening 30 of thehousing 24 and thefuel tank 22 to permit air to enter thefuel tank 22 and fill the vacuum. - As shown in
FIGS. 4 and 5 , thecasing 36 may include a plurality ofribs 66 radially spaced about and adjacent the lower vacuumrelief vapor passage upper surface 60 of the lower portion of thecasing 36 defines theribs 66. Theribs 66 vertically space thefloat 64 from the lower vacuumrelief vapor passage float 64 is drawn vertically downward by a vacuum pressure. As such, theribs 66 prevent the vacuum pressure from drawing thefloat 64 downward into sealing engagement with the lower vacuum relief vapor passage 52. - Referring back to the embodiment in
FIGS. 2 and 3 , thehousing 24 includes aridge 68 disposed circumferentially about thevapor port 28, the lowerdynamic vapor passage 48 and the lower vacuumrelief vapor passage ridge 68 may include any suitable shape, including but not limited to, a circular shape or a rectangular shape. - The
anti-trickle valve 34 is movable between a first position, shown inFIG. 2 , and a second position, shown inFIG. 3 . When in the first position, theanti-trickle valve 34 is disposed in sealing engagement with theridge 68 to seal thevapor port 28, the lowerdynamic vapor passage 48 and the lower vacuumrelief vapor passage interior opening 30 of thehousing 24. When in the second position, theanti-trickle valve 34 is vertically spaced from theridge 68 to permit fluid communication, and particularly vapor communication, around a periphery of theanti-trickle valve 34 between thevapor port 28 and theoutlet 26. Thehousing 24 may define a plurality of flow channels (not shown) disposed about the periphery of thecasing 36 to facilitate fluid communication around the periphery of theanti-trickle valve 34. - The fuel vapor
vent valve assembly 20 further includes abiasing device 70. The biasingdevice 70 is configured for biasing theanti-trickle valve 34 into the first position. The biasingdevice 70 may include, but is not limited to, a coil spring or the like. The biasingdevice 70 has a stiffness sufficient to resist movement of theanti-trickle valve 34 when it responds to a vapor pressure from within thefuel tank 22 having a value less than a first predetermined value (e.g., less than 3 kPa). Accordingly, if the vapor pressure within thefuel tank 22 and at thevapor port 28 is less than 3 kPa, then the biasingdevice 70 maintains theanti-trickle valve 34 in the first position. However, if the vapor pressure within thefuel tank 22 and at thevapor port 28 rises to above 3 kPa, then the pressure exerted on theanti-trickle valve 34 from the vapor pressure is sufficient to move thebiasing device 70, e.g., compress the coil spring, and move theanti-trickle valve 34 into the second position. When in the second position, large quantities of vapor from within thefuel tank 22 may escape in a short amount of time. - While the best modes for carrying out the invention have been described in detail, those familiar with the art to which this invention relates will recognize various alternative designs and embodiments for practicing the invention within the scope of the appended claims.
Claims (20)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/767,856 US8371326B2 (en) | 2009-05-11 | 2010-04-27 | Fuel vapor vent valve with dynamic pressure relief |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17699809P | 2009-05-11 | 2009-05-11 | |
US12/767,856 US8371326B2 (en) | 2009-05-11 | 2010-04-27 | Fuel vapor vent valve with dynamic pressure relief |
Publications (2)
Publication Number | Publication Date |
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US20100282335A1 true US20100282335A1 (en) | 2010-11-11 |
US8371326B2 US8371326B2 (en) | 2013-02-12 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/767,856 Expired - Fee Related US8371326B2 (en) | 2009-05-11 | 2010-04-27 | Fuel vapor vent valve with dynamic pressure relief |
Country Status (9)
Country | Link |
---|---|
US (1) | US8371326B2 (en) |
EP (1) | EP2430342B1 (en) |
JP (1) | JP5678346B2 (en) |
KR (1) | KR101630900B1 (en) |
CN (2) | CN201866351U (en) |
AU (1) | AU2010247088B2 (en) |
MX (1) | MX2011012097A (en) |
PL (1) | PL2430342T3 (en) |
WO (1) | WO2010131099A1 (en) |
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KR20140007917A (en) * | 2011-02-28 | 2014-01-20 | 보르그워너 인코퍼레이티드 | Variable flow check valve for hydraulic tensioner |
FR2996279A1 (en) * | 2012-09-28 | 2014-04-04 | Inergy Automotive Systems Res | VENTILATION VALVE FOR A LIQUID RESERVOIR INCLUDING ANTI-PRESSURE SAFETY. |
EP2908035A1 (en) * | 2014-02-13 | 2015-08-19 | Eaton Corporation | Fuel tank vent valve assembly and method of assembly |
WO2015127477A1 (en) * | 2014-02-24 | 2015-08-27 | Eaton Corporation | Fuel tank liquid vapor discriminator with integrated over-pressure and make-up air valves |
US20150377196A1 (en) * | 2014-03-17 | 2015-12-31 | Kyosan Denki Co., Ltd. | Liquid fuel catcher |
US9360872B2 (en) | 2011-12-22 | 2016-06-07 | Eaton Corporation | Fuel tank vent valve assembly and method of assembly |
US9939073B2 (en) * | 2016-02-04 | 2018-04-10 | FlowTech Fueling, LLC | Breather check valve |
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US8371326B2 (en) * | 2009-05-11 | 2013-02-12 | Eaton Corporation | Fuel vapor vent valve with dynamic pressure relief |
US8342453B2 (en) * | 2010-02-09 | 2013-01-01 | Thunder Bay Aircraft Leasing Inc. | System for airborne transport of flammable liquids |
DE102011116941A1 (en) | 2011-10-26 | 2013-05-02 | Kautex Textron Gmbh & Co. Kg | vent valve |
JP6113146B2 (en) | 2012-03-22 | 2017-04-12 | 株式会社ニフコ | Valve device for fuel tank |
CN103362705B (en) * | 2012-03-29 | 2016-12-14 | 比亚迪股份有限公司 | A kind of fuel tank is protected valve and has the fuel tank of this protection valve |
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FR3003543B1 (en) | 2013-03-22 | 2015-12-25 | Eurocopter France | RESERVOIR HAVING A PRESSURE RELIEF VALVE |
WO2015133039A1 (en) * | 2014-03-05 | 2015-09-11 | 株式会社パイオラックス | Valve device for fuel tank |
JP6334960B2 (en) * | 2014-03-05 | 2018-05-30 | 株式会社パイオラックス | Valve device for fuel tank |
US20190011073A1 (en) * | 2015-07-29 | 2019-01-10 | A.R.I. Flow Control Accessories Ltd. | Fluid flow valve |
BR102018067630B1 (en) * | 2018-09-03 | 2020-10-27 | Miguel Greyde Avila Dias | thermodynamic valve for retaining vapors and gases and for pressure and vacuum relief |
EP3880583A4 (en) * | 2018-11-14 | 2023-01-04 | Franklin Fueling Systems, LLC | Pressure vacuum valve |
JP7340038B2 (en) * | 2019-12-24 | 2023-09-06 | 株式会社パイオラックス | valve device |
US11795049B2 (en) | 2020-12-30 | 2023-10-24 | Vapor Systems Technologies, Inc. | Pressure/vacuum (PV) valve for fuel storage tanks, in-line pressure-vacuum valve test unit, and combination thereof |
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- 2010-05-11 JP JP2012510380A patent/JP5678346B2/en not_active Expired - Fee Related
- 2010-05-11 PL PL10725850T patent/PL2430342T3/en unknown
- 2010-05-11 EP EP20100725850 patent/EP2430342B1/en not_active Not-in-force
- 2010-05-11 AU AU2010247088A patent/AU2010247088B2/en not_active Ceased
- 2010-05-11 WO PCT/IB2010/001082 patent/WO2010131099A1/en active Application Filing
- 2010-05-11 KR KR1020117029604A patent/KR101630900B1/en active IP Right Grant
- 2010-05-11 CN CN2010202734806U patent/CN201866351U/en not_active Expired - Fee Related
- 2010-05-11 CN CN201010241541.5A patent/CN101968134B/en not_active Expired - Fee Related
- 2010-05-11 MX MX2011012097A patent/MX2011012097A/en not_active Application Discontinuation
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KR20140007917A (en) * | 2011-02-28 | 2014-01-20 | 보르그워너 인코퍼레이티드 | Variable flow check valve for hydraulic tensioner |
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US9939073B2 (en) * | 2016-02-04 | 2018-04-10 | FlowTech Fueling, LLC | Breather check valve |
Also Published As
Publication number | Publication date |
---|---|
JP5678346B2 (en) | 2015-03-04 |
WO2010131099A1 (en) | 2010-11-18 |
CN101968134B (en) | 2014-04-23 |
EP2430342A1 (en) | 2012-03-21 |
EP2430342B1 (en) | 2013-02-13 |
CN201866351U (en) | 2011-06-15 |
MX2011012097A (en) | 2012-01-25 |
KR101630900B1 (en) | 2016-06-15 |
PL2430342T3 (en) | 2013-07-31 |
CN101968134A (en) | 2011-02-09 |
US8371326B2 (en) | 2013-02-12 |
KR20120023775A (en) | 2012-03-13 |
AU2010247088A1 (en) | 2011-12-01 |
JP2012526701A (en) | 2012-11-01 |
AU2010247088B2 (en) | 2013-07-25 |
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